Underground mine communications have been terrible for decades. Leaky feeder systems, mesh networks, and WiFi all have significant limitations. Now 5G trials are showing potential to actually solve the connectivity problem.

Whether that potential translates to industry-wide deployment is still an open question.

What’s Wrong With Current Systems

Most underground mines use leaky feeder cable—basically a coaxial cable with gaps that “leak” radio signals. It works for voice communications but bandwidth is limited and installation is expensive and fragile.

WiFi mesh networks have become more common, especially in newer developments. They offer better data capacity than leaky feeder but still struggle with handoff latency when vehicles or workers move between access points.

According to Mining Technology Magazine, these handoff delays can be 500ms or longer, which is problematic for real-time applications like autonomous vehicle control or continuous monitoring systems.

Then there’s coverage gaps. Every mine has dead zones where communications drop out entirely. That’s a safety issue as much as an operational one.

Why 5G Might Be Different

Private 5G networks—the ones mines would deploy themselves, not commercial carrier networks—offer several advantages over existing infrastructure.

Ultra-low latency is the big one. 5G can deliver 10-20ms latency even in challenging underground RF environments. That’s fast enough for real-time control of autonomous equipment or instant video transmission from remote areas.

Bandwidth is another factor. 5G can handle hundreds of devices simultaneously without degradation. As mines add more sensors, cameras, and autonomous systems, that capacity becomes critical.

The network slicing capability is interesting too. You can partition a single 5G network into multiple virtual networks with different performance characteristics. Critical safety systems get priority over lower-priority data traffic.

Australian Trial Results

Several Australian operations are running 5G trials. Roy Hill’s underground expansion in WA has deployed a private 5G network covering part of their development drives, testing autonomous LHD communication and real-time geological data transmission.

Early results suggest 5G can maintain reliable connectivity with moving vehicles traveling at 15-20 km/h underground, with handoff delays under 50ms. That’s a significant improvement over WiFi mesh performance.

BHP’s Olympic Dam operation is testing 5G for remote equipment monitoring and predictive maintenance applications. They’re using the network to stream high-definition video from fixed cameras and worker helmet cams, something that would saturate older leaky feeder systems.

None of these trials have published definitive ROI numbers yet. But the technical performance seems to support the hype, at least in controlled deployments.

The Automation Angle

Autonomous underground mining requires reliable, low-latency communications. You can’t have a 50-tonne LHD losing connection mid-cycle.

Current automation systems often use dedicated radio systems or rely on pre-programmed routes that don’t need constant connectivity. That limits flexibility and requires extensive infrastructure.

5G could enable truly remote operation of underground equipment, where operators control vehicles from surface in real-time via video feed and control inputs. Team400 has worked with mining companies on AI control systems that depend on millisecond-level response times—something only possible with 5G-class connectivity.

The other application is multi-vehicle coordination. With sufficient bandwidth and low latency, autonomous trucks, loaders, and drills can communicate with each other and a central control system, optimizing traffic flow and avoiding conflicts.

That level of coordination needs reliable network performance that current systems can’t consistently deliver.

Installation Challenges

Here’s the less glamorous reality: installing 5G infrastructure underground is expensive and disruptive.

You need distributed antenna systems (DAS) throughout the mine, with fiber optic backbone connecting back to surface. Every time the mine advances, you’re extending that infrastructure into new areas.

Antennas need to be hardened for underground conditions—dust, humidity, vibration, occasional rock falls. Commercial 5G equipment isn’t designed for that environment, so purpose-built hardware costs more.

Cable installation requires drilling and bolting into walls or hanging from roof support. In active production areas, that means coordinating with operations to find installation windows that don’t impact output.

One mining engineer told me their 5G pilot cost about $2 million to cover a 2km section of decline and associated drives. Scale that across an entire underground operation and you’re looking at $10-20 million in infrastructure investment.

Integration With Existing Systems

Mines can’t just rip out all their old communications gear and replace it with 5G overnight. The transition will be gradual, which means running parallel systems for years.

That creates integration complexity. Voice systems still run on leaky feeder. WiFi continues handling some data traffic. 5G covers new developments and automation systems. How do these networks interoperate?

The IT infrastructure to manage multiple network types adds cost and requires specialized skills that aren’t common in mining operations. You need people who understand both networking and mining operations—a rare combination.

Spectrum and Licensing

Unlike surface operations where you might use commercial carrier 5G, underground mines need their own private spectrum allocations to ensure reliability and control.

In Australia, the ACMA (Australian Communications and Media Authority) has allocated specific spectrum bands for private networks, but the licensing process isn’t straightforward. Each operation needs to apply, demonstrate technical competence, and commit to interference management.

For mines in remote areas, this is usually manageable. Operations near population centers might have more difficulty securing clean spectrum, especially if commercial carriers are using adjacent bands.

What Happens Next

5G deployment in Australian mines will likely follow the pattern of most mine technology adoption: cautious pilots in a few operations, gradual expansion if results are positive, then broader industry uptake over 5-10 years.

Costs need to come down. Installation needs to become less disruptive. The business case needs to be demonstrated with hard numbers, not just technical performance metrics.

But the technology appears capable of solving longstanding communications problems that have limited underground automation and real-time data applications for decades.

Whether that capability translates to industry-wide transformation or remains a niche solution in select operations depends on how well vendors and mines can manage the transition complexity and demonstrate genuine value.

Too early to call it a revolution. Not too early to take it seriously.